Mount for condenser lenses



C. W. KEUFFEL MOUNT FOR CONDENSER LENSES June 9, 1925'.

Filed Nov. 6, 1922 To all whom it may concern:

' is made smaller than the holder used in the Patented June 9, 1925.

v UNITED, STATES [PATENTifor'Flc-s;

cam, w. KEUFFEL, on WEEHAWKEN TOWNSHIP, Henson country, new JERSEY, AS-

sxenon TO KEUFFEL a assumed, on nononnn, NEW JERSEY, A-comoRA'rIoN or I NEW JERSEY.

Application filed November Be it known that I, CARL-W. Kansans, a citizen of the United States, residing at the township of Weehawken, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in a Mount for. Condenser Lenses, of which the-following is a specification.

My invention relates to amount and guard for a condenser lens, and the novelty consists in the adaptation and arrangement of parts, as ,will be more fully hereinafter pointed out. I

For economic and sometimes for practical Inanufacturing reasons, a condensing lens type of projection machine'now most Widely used in thisart. Such lenses are therefore not adapted to such projection ma chines, althoughthey are often superior as condensers and are materially cheaperto make.

, M device is adapted to make such lenses avm able for use 111 pro ecting machines so that they can be so used without the heavy expense of making a newconde'nser holder for said machines. My device is also adapt- .to protect the condenser lens from being pitted or scarred by the .arc lamps used insuch projection machines, and to enable the condenser lens to be placed close to the are;

I lamp sons to get all of the available light.

ed to be removably secured to said'hol er- L member 3 by means of screws 8, and'brack 'ets 9 are also adapted. to be secured to said Referring to, the drawings Figure 1 is'a front elevation of my device; and Figure 2 is a side elevation of the same with the mount in section. I, I

In the drawings 3 1s a circular metal holder member having a beveled face 4 and an 'interior circular groove 5 in which is an asbestos, or otherheatinsulatingliner 6.

A circular metal retaining plate 7 is ada tholder .3 by said screws 8. Said brackets 9 to receive acondensing lens '11 which will fit iI tO the same so that the outer circulall'l ed to carry atransparent guard plate so as moonr non connnnsnni nnnsns. a

edge of amiss- 11 M11 rest i013: as heat insulating liner 6; and said liner 6 will prevent the heat from the holder member 3 from being quickly transferred to the lens 11- as the holder 3.is heated through its proximity to the light source in the projec tion .mael1ine, and thereby prevents breakmg of lens 11 because ofuqulck tem erature changes. The circular retaining p ate 7 isthen adapted to be secured in position by; means of screws 8 so as to hold the lens 11'- in the holder member 3.

A transparent guard plate 12 is adapted to be mounted in the hooked lips 10 of the brackets 9 so as to protect aface 13 of the lens 11 which is ex sed tothe. source of light in the projection" machine when the holdermember 3 is in position-for use, and to permit of said lens 11 being placed closer to the source of light. a

A holder member 3 the lens holder now in. use in most tionmachines so that face l4 of said one 11 will be away from the lightsource, and face has the beveled face I which enables the lens 11 to centre itself in rojec- 13 with. the -.guard plate 12 will be next to said light source.

Iclalmr'fr.

' 1. In a mount for a condenser lens the combination of a holdermember ,havin a heat insulating lining and a reta ning plate' removablysecured to "said holder member which is adapted to fit the ordinary condenser holder of projection machines, and brackets removab y mounted on said holder member and a transparent guard plate mounted in said brackets.

'2. In a mount .for a condenserlens the combination of a' holder member and a retaining plate removablyjsecured to said holderi'nember which are both adapted to holder member and guard plate. In testimony whereof I aflix my signature.

fit. the'ordinary condenser holder of pro- 

